JP2017001772A - Image formation apparatus and sheet conveyance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of malfunction due to energization means energizing rotation parts while reducing the number of components of conveyance means having a drive member and the plurality of rotation parts energized by the drive member.SOLUTION: As shown in Fig.(A), a support member 600 supporting a rotation roll 520 is provided. The support member 600 is energized toward a drive roll 510. Two support members 600 are provided so as to correspond to two rotation rolls 520. As shown in Fig.(B), one rotation roll 520 is provided with two rotation parts 521 (left side rotation part 521A, right side rotation part 521B). One support member 600 is shared by the two rotation parts 521, and the two rotation parts 521 are supported by the shared support member 600.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image forming apparatus and a sheet conveying apparatus.

  Patent Document 1 discloses an image forming apparatus in which a coil spring is installed so that a vertical line passing through the axis of the discharge driven roller passes through the inside of the outer periphery of the coil spring on a central surface equidistant from both end surfaces of the discharge driven roller. Is disclosed.

JP 2014-172688 A

The conveyance of the sheet is performed by, for example, a conveyance unit that includes a driving member that performs rotational driving and a plurality of rotating units that rotate following the driving member.
Here, in such a conveying unit, the urging unit may be urged to the driving member. However, if the urging unit is provided corresponding to each of the plurality of rotating units, the number of parts increases. Invite. Also, when urging the rotating part, for example, if the rotating part is urged by directly pressing an urging means such as a wire spring against the rotating part, abnormal noise is likely to occur and wear of the rotating part is promoted. It becomes easy to be done.
The object of the present invention is to solve the problems caused by the urging means for urging the rotating part while reducing the number of parts of the conveying means having the driving member and a plurality of rotating parts urged by the driving member. It is to make it difficult to happen.

According to the first aspect of the present invention, an image forming unit that forms an image on a recording material, a drive member that is driven to rotate, a drive member that is arranged side by side in the axial direction of the drive member, and a contact member that is placed in contact with the drive member. A plurality of rotating portions that rotate by receiving a driving force from a member, and a conveying unit that conveys a recording material; and the plurality of rotating portions that are shared, support the plurality of rotating portions, and the driving member And an urging unit that urges the support member toward the drive member from a side opposite to the side on which the rotating member is installed.
According to a second aspect of the present invention, the support member has a rotation shaft extending along the axial direction of the drive member, is provided to be rotatable about the rotation shaft, and the biasing means is configured to rotate the rotation member. The image forming apparatus according to claim 1, wherein a force for rotating the support member about an axis is applied to the support member to bias the support member toward the drive member.
According to a third aspect of the present invention, the support member is urged toward the drive member, and the rotation unit is pressed against the drive member, so that the drive member is curved, and the plurality of rotation units The image forming apparatus according to claim 1, wherein the support member is variably provided so that each of the support members moves following the curved driving member.
According to a fourth aspect of the present invention, a detachment prevention portion is provided on the main body side of the image forming apparatus, and a part of the support member is inserted to prevent the detachment of the support member from the main body side. The part of the prevention member into which the part of the support member is inserted is formed by an elongated hole extending in a direction in which the support member is urged. The image forming apparatus according to any one of the above.
According to a fifth aspect of the present invention, there is provided a drive member that is rotationally driven, and a plurality of rotations that are arranged side by side in the axial direction of the drive member and that are arranged in contact with the drive member and receive a driving force from the drive member and rotate. A plurality of rotating units that are shared by the plurality of rotating units, support the plurality of rotating units, and from the side opposite to the side where the driving member is installed. And a biasing unit that biases the support member toward the driving member.
According to a sixth aspect of the present invention, the support member is urged toward the drive member, and the rotation portion is pressed against the drive member, so that the drive member is curved, and the plurality of rotation portions are 6. The paper conveying apparatus according to claim 5, wherein the support members are variably provided so that each of them moves following the curved driving member.
According to a seventh aspect of the present invention, the support member is provided so as to be swingable about a predetermined swing center, and a predetermined pressed portion is pressed by the biasing means. The driving member is biased toward the driving member, and the position of the swing center in the axial direction of the driving member and the position of the pressed portion in the axial direction are aligned in the axial direction. A paper conveying device according to claim 5 or 6.

According to the first aspect of the present invention, the biasing means is provided corresponding to each of the plurality of rotating portions, and the driving member and the driving member are biased as compared with the case where the rotating portion is directly pressed by the biasing means. While reducing the number of parts of the conveying means having a plurality of rotating parts, it is possible to make it difficult to cause problems due to the urging means for urging the rotating part.
According to the second aspect of the present invention, the supporting member can be biased to the driving member without installing the biasing means on the side opposite to the side where the driving member is provided with the supporting member interposed therebetween.
According to the invention of claim 3, the rotating portion can be moved following the driving member that is curved.
According to the fourth aspect of the present invention, it is possible to suppress the movement of the support member that attempts to move following the drive member from being restricted by the separation preventing portion.
According to the fifth aspect of the present invention, the biasing means is provided corresponding to each of the plurality of rotating portions, and the driving member and the driving member are biased as compared with the case where the rotating portion is directly pressed by the biasing means. While reducing the number of parts of the conveying means having a plurality of rotating parts, it is possible to make it difficult to cause problems due to the urging means for urging the rotating part.
According to the invention of claim 6, the rotating portion can be moved following the driving member that is curved.
According to the seventh aspect of the present invention, the support member can easily follow the curved drive member regardless of whether the support member is installed on one end side or the other end side in the axial direction of the drive member.

1 is an overall configuration diagram when an image forming apparatus is viewed from a front side. (A), (B) is a figure explaining a discharge roll. It is a perspective view of a support member and a rotating roll. It is a figure at the time of seeing a rotation roll, a supporting member, a drive roll, etc. from the arrow IV direction of FIG. It is a front view of a support member in the state where a rotating roll was removed. (A), (B) is a figure explaining the structure around the 1st columnar protrusion and the structure around the 2nd columnar protrusion. It is a figure explaining rocking | fluctuation of a supporting member. It is the figure which showed the modification of the supporting member. It is the figure which showed the comparative example regarding support of a rotating roll.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is an overall configuration diagram when the image forming apparatus 1 according to the present embodiment is viewed from the front side.
The image forming apparatus 1 is a so-called tandem color printer. The image forming apparatus 1 includes an image forming process unit 10 as an example of an image forming unit that forms an image on a sheet that is an example of a recording material. The image forming process unit 10 forms an image on a sheet based on the image data of each color.

The image forming apparatus 1 is provided with a control unit 30 that controls the overall operation of the image forming apparatus 1. Further, the image forming apparatus 1 is provided with an image processing unit 35.
The image processing unit 35 performs image processing on image data transmitted from the personal computer (PC) 3, the image reading device 4, or the like. Further, the image forming apparatus 1 is provided with a main power source 36 that supplies power to each unit.

The image forming process unit 10 is provided with four image forming units 11Y, 11M, 11C, and 11K (hereinafter collectively referred to as “image forming unit 11”) that are arranged in parallel at regular intervals. It has been.
Each image forming unit 11 has the same configuration except for toner stored in a developing device 15 (described later). Each image forming unit 11 forms yellow (Y), magenta (M), cyan (C), and black (K) toner images.

Each of the image forming units 11 is provided with a photosensitive drum 12, a charger 200 that charges the photosensitive drum 12, and an LED print head (LPH) 300 that exposes the photosensitive drum 12.
The photosensitive drum 12 is charged by the charger 200. Further, the photosensitive drum 12 is exposed by the LPH 300, and an electrostatic latent image is formed on the photosensitive drum 12.
Further, each image forming unit 11 is provided with a cleaner (not shown) for cleaning the surface of the photosensitive drum 12 and a developing device 15 for developing the electrostatic latent image formed on the photosensitive drum 12.

  Further, the image forming process unit 10 includes an intermediate transfer belt 20 onto which the color toner images formed on the photosensitive drum 12 are transferred, and the color toner images formed on the photosensitive drum 12 to the intermediate transfer belt 20. A primary transfer roll 21 for sequential transfer (primary transfer), a secondary transfer roll 22 for batch transfer (secondary transfer) of the toner image transferred on the intermediate transfer belt 20 to the paper, and a secondary transferred image on the paper A fixing device 45 for fixing is provided.

  In the image forming apparatus 1, image data from the PC 3 and the image reading device 4 is subjected to image processing by the image processing unit 35 and supplied to each image forming unit 11 via an interface (not shown). For example, in the black (K) color image forming unit 11K, the photosensitive drum 12 is charged by the charger 200 while rotating in the direction of arrow A, and light is emitted based on the image data transmitted from the image processing unit 35. The exposure is performed by the LPH 300.

As a result, an electrostatic latent image related to a black (K) color image is formed on the photosensitive drum 12.
The electrostatic latent image formed on the photosensitive drum 12 is developed by the developing device 15, and a black (K) toner image is formed on the photosensitive drum 12.
Similarly, yellow (Y), magenta (M), and cyan (C) color toner images are formed in the image forming units 11Y, 11M, and 11C, respectively.

The color toner images formed by the image forming units 11 are sequentially electrostatically attracted by the primary transfer roll 21 on the intermediate transfer belt 20 that moves in the direction of arrow B to form a toner image on which the color toners are superimposed. The
The toner image on the intermediate transfer belt 20 is conveyed to a region (secondary transfer portion T) where the secondary transfer roll 22 is disposed as the intermediate transfer belt 20 moves.

When the toner image is conveyed to the secondary transfer unit T, the paper is supplied from the sheet holding unit 40 to the secondary transfer unit T in accordance with the timing at which the toner image is conveyed to the secondary transfer unit T.
Then, the toner image on the intermediate transfer belt 20 is electrostatically transferred collectively to the conveyed paper by the transfer electric field formed by the secondary transfer roll 22 in the secondary transfer portion T.

Thereafter, the sheet on which the toner image has been electrostatically transferred is peeled off from the intermediate transfer belt 20 and conveyed to the fixing device 45. The toner image on the paper transported to the fixing device 45 is fixed on the paper by the fixing device 45 by a fixing process using heat and pressure.
Then, the sheet after the fixing is completed is conveyed to the sheet stacking unit 41 by the discharge roll 500 that functions as a conveying unit.
Here, the portion of the image forming apparatus 1 where the discharge roll 500 is provided has a function of transporting paper, and this portion can be regarded as a paper transport device.

2A and 2B are diagrams illustrating the discharge roll 500. FIG.
2A is a view when the discharge roll 500 is viewed from the direction of arrow II in FIG. FIG. 2B is a diagram illustrating the rotating roll 520.
As shown in FIG. 2A, the discharge roll 500 of this embodiment includes a drive roll 510 and two rotating rolls 520.
A driving roll 510 as an example of a driving member is supported at both ends in the axial direction by the main body side of the image forming apparatus 1. The drive roll 510 is disposed in a state perpendicular to the sheet conveyance direction, and rotates by receiving a rotational driving force from a motor (not shown).

Two rotating rolls 520 provided are arranged side by side along the axial direction of the drive roll 510. Each rotating roll 520 is disposed in contact with the driving roll 510 and rotates by receiving a driving force from the driving roll 510.
The sheet conveyed to the discharge roll 500 through the fixing device 45 (see FIG. 1) is sandwiched between the driving roll 510 and the two rotating rolls 520 and receives a conveying force from the driving roll 510 to receive a sheet stacking unit. 41 (see FIG. 1).

As shown in FIG. 2B, each rotating roll 520 is provided with two rotating portions 521. Hereinafter, in the present specification, one rotating unit 521 located on the left side in the figure is referred to as a left side rotating part 521A, and the other rotating part located on the right side in the figure is referred to as a right side rotating part 521B.
In each of the rotating rolls 520, a shape imparting roll 521C that imparts a waveform shape to the paper is provided between the left rotating unit 521A and the right rotating unit 521B.

Further, as shown in FIG. 2B, a left connection part 521D that connects the left rotation part 521A and the shape imparting roll 521C, and a right connection part 521E that connects the right rotation part 521B and the shape imparting roll 521C are provided. ing.
Each of the rotating rolls 520 is configured by injection molding (resin material), and the left rotating part 521A, the right rotating part 521B, the left connecting part 521D, the right connecting part 521E, and the shape imparting roll 521C are integrated. .

Each of the left rotating part 521 </ b> A and the right rotating part 521 </ b> B is formed in a cylindrical shape and arranged in a state of being aligned along the axial direction of the drive roll 510.
Further, each of the left rotation unit 521 </ b> A and the right rotation unit 521 </ b> B is disposed in contact with the drive roll 510 and rotates by receiving a rotational driving force from the drive roll 510.

  In the shape imparting roll 521C, the diameter of the central portion in the axial direction is larger than the diameter of both end portions in the axial direction. When the sheet passes through the shape imparting roll 521C, the sectional shape of the sheet becomes a waveform. As a result, the bending rigidity of the sheet is increased, and the sheet is prevented from being discharged to the sheet stacking unit 41 (see FIG. 1) in a state where the leading end of the sheet hangs down.

Moreover, in this embodiment, as shown to FIG. 2 (A), the supporting member 600 which supports the rotating roll 520 is provided.
The support member 600 is provided on the side opposite to the side on which the drive roll 510 is installed with the rotary roll 520 interposed therebetween. Two support members 600 are provided so as to correspond to each of the two rotary rolls 520 provided.

  Furthermore, in this embodiment, two rotating units 521 (left rotating unit 521A and right rotating unit 521B) are provided in one rotating roll 520, but one support member 600 is provided for the two rotating units 521. Are shared, and the two rotating parts 521 are supported by a common support member 600 (single support member 600). Here, in the present embodiment, the support member 600 supports the two rotating portions 521 from the side opposite to the side where the drive roll 510 that is a drive member is installed.

  Here, a mode in which one supporting member 600 is provided corresponding to one rotating portion 521 and one supporting member 600 is provided for each rotating portion 521 is also conceivable. However, in this case, the number of parts is increased and manufacturing is performed. Cost increases. On the other hand, in the present embodiment, one support member 600 is provided for every two rotating parts 521, and the number of parts is reduced.

  FIG. 3 is a perspective view of one of the support member 600 and the rotary roll 520 provided, and one of the support members 600 and the rotary roll 520. More specifically, FIG. 2A is a perspective view of a support member 600 and a rotary roll 520 located on the right side in the drawing. The left support member 600 and the rotary roll 520 are configured in the same manner as the right support member 600 and the rotary roll 520.

  The support member 600 is provided with a base 610 having a recess 610 </ b> A that accommodates the shape imparting roll 521 </ b> C. The base 610 is disposed along the axial direction of the drive roll 510. Further, the support member 600 is provided with an arm portion 620 extending from the left side surface of the base 610 along the left direction in the figure, and a protrusion 630 protruding downward from the base 610.

  Further, the support member 600 is provided with a first support portion 635 that is provided on the left side of the concave portion 610A in the drawing and supports the left connection portion 521D (see FIG. 2B) of the rotary roll 520 from below. Further, on the right side of the concave portion 610A in the drawing, a second support portion 640 that supports the right connection portion 521E (see FIG. 2B) of the rotary roll 520 from below is provided.

Further, in the present embodiment, a coil spring 700 that functions as a biasing unit that biases the support member 600 toward the drive roll 510 is provided.
In the present embodiment, the protruding portion 630 provided on the support member 600 functions as a pressed portion that is pressed by the coil spring 700, and the protruding portion 630 is pressed by the coil spring 700. As a result, the support member 600 rotates in the direction indicated by the arrow 3A in the figure, and the rotation of the support member 600 toward the drive roll 510 and the rotary roll 520 is performed. A mechanism for rotating the support member 600 will be described later.

4 is a view when the rotary roll 520, the support member 600, the drive roll 510, and the like are viewed from the direction of the arrow IV in FIG.
Although not shown in FIGS. 2 and 3, the support member 600 has a first columnar protrusion 651 that functions as a rotation axis, and is rotatable about the first columnar protrusion 651.
The first columnar protrusion 651 is formed in a columnar shape, and is provided in a state along the axial direction of the rotary roll 520 and the axial direction of the drive roll 510.

  Further, in the present embodiment, an apparatus frame F is provided on the main body side of the image forming apparatus 1. In the present embodiment, a coil spring 700 is disposed between the device frame F and the protruding portion 630 of the support member 600. As a result, in this embodiment, a force that rotates the support member 600 around the first columnar protrusion 651 is applied to the support member 600, the support member 600 rotates in the clockwise direction in the figure, and the support member 600 is driven. It is biased toward the roll 510 and the rotating roll 520.

In the configuration of the present embodiment, since the support member 600 is not pressed from below to bias the support member 600, the lower portion of the support member 600 (indicated by reference numeral 4A in the drawing) is empty, The lower space can be used.
In other words, in this embodiment, the support member 600 can be urged to the drive roll 510 without installing the urging means on the side opposite to the side where the drive roll 510 is provided with the support member 600 interposed therebetween. .

When the support member 600 is biased toward the driving roll 510, the rotating roll 520 is pressed against the driving roll 510. And in this embodiment, the reaction force shown by the arrow 4B in the figure acts on the rotating roll 520 and the support member 600 by this pressing.
When this reaction force acts on the support member 600, the first columnar protrusion 651 provided on the support member 600 is pressed against the apparatus frame F.

FIG. 5 is a front view of the support member 600 with the rotary roll 520 removed.
In the present embodiment, the first columnar protrusion 651 is provided on the apparatus frame F side with respect to the base 610. The support member 600 is provided with a protrusion 652 that protrudes from the base 610 toward the apparatus frame F, and the first columnar protrusion 651 protrudes from the side surface of the protrusion 652. Here, the first columnar protrusion 651 is provided at a location facing the central portion in the longitudinal direction of the base 610.

Further, the support member 600 is provided with a second columnar protrusion 653. The second columnar protrusion 653 is provided at the tip of the arm portion 620.
More specifically, a protruding portion 654 that protrudes toward the apparatus frame F side is also provided at the tip of the arm portion 620, and the second columnar protrusion 653 protrudes from the side surface of the protruding portion 654.

Here, the second columnar protrusion 653 is arranged along the axial direction of the rotary roll 520 and the axial direction of the drive roll 510, similarly to the first columnar protrusion 651.
In addition, the protruding direction of the first columnar protrusion 651 and the protruding direction of the second columnar protrusion 653 are both rightward in the drawing, and the protruding direction of the first columnar protrusion 651 and the protruding direction of the second columnar protrusion 653 are both. Is the same.

Further, in the present embodiment, the support member 600 is swung around the position where the first columnar protrusion 651 is provided as a swing center. More specifically, the support member 600 can swing so that each of the first support portion 635 and the second support portion 640 moves forward and backward with respect to the drive roll 510 (see FIG. 2A). ing.
Further, in the present embodiment, the protruding portion 630 functions as a pressed part, and the pressed part is pressed by the coil spring 700.

Further, in the present embodiment, the position of the first columnar protrusion 651 and the position of the protrusion 630 are aligned in the left-right direction in the drawing (in the axial direction of the drive roll 510), and the position of the swing center of the support member 600 is And the position of the to-be-pressed site | part pressed by the coil spring 700 of the supporting member 600 has gathered.
In addition, in this embodiment, on one straight line (on a straight line indicated by reference numeral 5A) extending along a direction orthogonal to the axial direction (left-right direction in the figure) of the drive roll 510, the swing center and the pressed object The part is located.

Thereby, in this embodiment, the swing of the support member 600 is more likely to occur than when the position of the swing center and the position of the pressed part are not aligned.
In other words, both the swing of the support member 600 in which the support member 600 rotates in the direction indicated by reference numeral 5B in the figure and the swing of the support member 600 in which the support member 600 rotates in the direction indicated by reference numeral 5C in the figure are likely to occur. ing. Thereby, in this embodiment, it is easy to share the support member 600 (described later).

  FIGS. 6A and 6B are diagrams illustrating the configuration around the first columnar protrusion 651 and the configuration around the second columnar protrusion 653. Specifically, FIG. 6A is a view when the first columnar protrusion 651 and the like are viewed from the direction of the arrow VIA in FIG. 5, and FIG. 6B is the second view from the direction of the arrow VIB in FIG. It is a figure at the time of looking at the columnar protrusion 653 and the like.

As shown in FIG. 6A, a first through hole H1 into which the first columnar protrusion 651 is inserted is formed on the apparatus frame F side. The first through hole H1 is formed in a substantially circular shape and has a diameter larger than the outer diameter of the first columnar protrusion 651.
In the present embodiment, as described above, the reaction force from the drive roll 510 acts on the support member 600, and the support member 600 is urged downward in FIG. As a result, the first columnar protrusion 651 is also urged downward, and the first columnar protrusion 651 is pressed against the device frame F.

  More specifically, the first columnar protrusion 651 is pressed against a portion of the peripheral edge 1X of the first through hole H1 that is located below the first columnar protrusion 651. When the first columnar protrusion 651 is pressed against the portion located below, a gap GP is formed above the first columnar protrusion 651. More specifically, a gap GP is formed between the first columnar protrusion 651 and a portion of the peripheral edge 1X of the first through hole H1 located above the first columnar protrusion 651.

As shown in FIG. 6B, the device frame F is formed with a second through hole H2 into which the second columnar protrusion 653 is inserted.
The portion of the apparatus frame F in which the second through hole H2 is provided functions as a separation prevention unit, restricts the movement of the second columnar protrusion 653 in the direction away from the apparatus frame F, and controls the image forming apparatus 1. The separation of the support member 600 from the main body is prevented.

Here, the second through hole H2 is formed by a long hole. The elongated hole is formed along the direction in which the support member 600 is urged (the direction indicated by the arrow 6C in the drawing, the direction of reaction force acting on the support member 600 from the drive roll 510).
In the present embodiment, the second through-hole H2 is formed as a long hole, so that the second columnar protrusion 653 can be displaced, and thereby the support member 600 swings (details will be described later). ).

  FIG. 7 is a diagram for explaining the swinging of the support member 600. In FIG. 7, with respect to the support member 600, the base 610 and the like are not shown, and only the first columnar protrusion 651 and the second columnar protrusion 653 are illustrated. Further, in FIG. 7, illustration of the rotating roll 520 is also omitted.

In the present embodiment, the support member 600 is urged toward the drive roll 510, and thereby, the rotation unit 521 (see FIG. 2) (the left rotation unit 521 </ b> A and the right rotation unit 521 </ b> B) provided on the rotation roll 520, Pressed against the drive roll 510.
Thereby, in this embodiment, as shown in FIG. 7, the drive roll 510 is curved so as to protrude upward in the drawing.

In this embodiment, the support member 600 is displaced so that the rotating unit 521 moves following the curve of the drive roll 510. More specifically, in the present embodiment, two rotating parts 521 are provided corresponding to each of the two supporting members 600 provided, but the two rotating parts 521 are driven. Each support member 600 is displaced so as to move following the roll 510.
More specifically, in the present embodiment, the support member 600 can swing around the first columnar protrusion 651, and the swinging portion of the support member 600 causes the rotating portion 521 to move with respect to the driving roll 510 that is deformed. Follow.

Here, the movement of the left support member 600 indicated by reference numeral 7A in FIG. 7 will be described.
In this embodiment, as a result of the drive roll 510 being curved so as to protrude upward in the drawing, the first columnar protrusion 651 of the support member 600 is more driven than the second columnar protrusion 653 of the support member 600. Trying to approach 510.

As a result, in the present embodiment, the support member 600 rotates counterclockwise in the drawing around the first columnar protrusion 651.
This suppresses the formation of a gap between the left rotating unit 521A and the right rotating unit 521B (see FIG. 2B) of the rotating roll 520 and the curved driving roll 510, and the left rotating unit 521A, Contact between the right rotation part 521B and the drive roll 510 is ensured.

  When the support member 600 rotates counterclockwise, the second columnar protrusion 653 moves downward as indicated by an arrow 7B in the figure, but as described above, the second through-hole into which the second columnar protrusion 653 is inserted. The hole H2 is formed by a long hole. For this reason, this movement of the second columnar protrusion 653 is allowed.

Next, the movement of the right support member 600 indicated by reference numeral 7C in FIG. 7 will be described.
In the right support member 600, the second columnar protrusion 653 tends to be closer to the drive roll 510 than the first columnar protrusion 651. As a result, in the present embodiment, the support member 600 rotates in the clockwise direction in the drawing around the first columnar protrusion 651.
Thereby, also in this case, it is suppressed that a gap is formed between the left rotation unit 521A and the right rotation unit 521B of the rotation roll 520 and the curved drive roll 510, and the left rotation unit 521A and the right rotation unit 521B. Then, contact with the drive roll 510 is ensured.

  When the support member 600 rotates in the clockwise direction, the second columnar protrusion 653 moves upward as indicated by reference numeral 7D in the figure, but as described above, the second through-hole into which the second columnar protrusion 653 is inserted. H2 is formed by a long hole, and this movement of the second columnar protrusion 653 is allowed.

Here, in this embodiment, as described above, the position of the swing center of the support member 600 and the position of the pressed part are aligned in the axial direction of the drive roll 510.
Furthermore, as shown in FIG. 5, a swing center (first columnar protrusion 651) and a pressed portion (protrusion 630) are provided at the center in the longitudinal direction of the base 610.

Thereby, in this embodiment, both the rotation of the support member 600 in the clockwise direction and the rotation in the counterclockwise direction are likely to occur.
Here, if the position of the center of oscillation is shifted from the position of the pressed part, either one of clockwise rotation and counterclockwise rotation is likely to occur, and the other is less likely to occur.

Further, in the present embodiment, the support member 600 is shared, and as shown in FIG. 2A, the two support members 600 each have the same shape.
Thereby, compared with the case where the shape of the one supporting member 600 and the shape of the other supporting member 600 are different, the cost required for manufacturing the image forming apparatus 1 is reduced.

  Here, in the present embodiment, as shown in FIG. 7, the driving roll 510 has a curved direction that is different between the facing position of the one supporting member 600 and the facing position of the other supporting member 600. In the present embodiment, both the clockwise rotation and the counterclockwise rotation of the support member 600 are likely to occur, and even if the driving roll 510 has a different bending direction, the common support member It becomes possible to cope with 600.

Note that, as shown in FIG. 5 and the like, in the present embodiment, the configuration in which the second columnar protrusion 653 is provided on the left side in the drawing has been described. .
Although not described above, the first columnar protrusion 651 also has a function of suppressing the separation of the support member 600 from the apparatus frame F. When the support member 600 is about to be detached from the apparatus frame F, the first columnar protrusion 651 is caught on the apparatus frame F, and the separation of the support member 600 from the main body side of the image forming apparatus 1 is suppressed.

FIG. 8 is a view showing a modified example of the support member 600. In addition, in FIG. 8, the state at the time of seeing the supporting member 600 and the rotating roll 520 from the upper side is shown.
In the embodiment described above, the configuration example in which the first columnar protrusion 651 is provided at the position opposite the central portion in the longitudinal direction of the base 610 has been described. However, as shown in FIG. You may provide the 1st columnar protrusion 651 in the opposing position of one end.
In the above description, as shown in FIG. 5, the first columnar protrusion 651 and the second columnar protrusion 653 are described as an example in the case of protruding in the right direction in the figure, but as shown in FIG. 8, The first columnar protrusion 651 and the second columnar protrusion 653 may protrude toward the left side in the drawing.

FIG. 9 is a view showing a comparative example regarding the support of the rotating roll 520.
In this comparative example, the wire spring 710 is pressed against the rotating roll 520, and the rotating roll 520 is biased toward the drive roll 510. By the way, in this comparative example, the metal wire spring 710 is pressed against the rotating roll 520, and the contact area between the rotating roll 520 and the wire spring 710 is reduced. For this reason, abnormal noise is likely to occur, and wear of the rotating roll 520 is likely to occur.

  In contrast, in the present embodiment, the metal coil spring 700 does not directly contact the rotary roll 520, but a resin support member 600 is provided between the coil spring 700 and the rotary roll 520, so that the stationary In this state, the support member 600 and the coil spring 700 are in contact with each other. In other words, in the present embodiment, the coil spring 700 is in contact with a member that does not perform rotational movement (the support member 600).

Furthermore, in this embodiment, the contact area of the rotating roll 520 and the contact member (supporting member 600) that contacts the rotating roll 520 is larger than that of the comparative example using the wire spring 710.
As a result, in this embodiment, compared to the comparative example, abnormal noise is less likely to occur, and wear of the rotating roll 520 is less likely to occur.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 10 ... Image forming process part, 500 ... Discharge roll, 510 ... Drive roll, 521 ... Rotating part, 600 ... Supporting member, 630 ... Protruding part, 651 ... 1st columnar protrusion, 700 ... Coil spring, H2 ... second through hole

Claims (7)

Image forming means for forming an image on a recording material;
A recording member is conveyed using a rotationally driven driving member and a plurality of rotating portions that are arranged side by side in the axial direction of the driving member and are arranged in contact with the driving member and rotate by receiving a driving force from the driving member. Conveying means for
A support member that is shared for the plurality of rotating parts, supports the plurality of rotating parts, and supports the plurality of rotating parts from the side opposite to the side on which the driving member is installed,
Biasing means for biasing the support member toward the drive member;
An image forming apparatus comprising: The support member has a rotation shaft extending along the axial direction of the drive member, and is provided rotatably about the rotation shaft.
The said urging means gives the force which rotates the said supporting member to the surroundings of the said rotating shaft to the said supporting member, and urges | biases the said supporting member toward the said drive member. Image forming apparatus. The support member is urged toward the drive member, and the rotation member is pressed against the drive member, so that the drive member is curved,
The image forming apparatus according to claim 1, wherein the support member is variably provided so that each of the plurality of rotating units moves following the curved driving member. . On the main body side of the image forming apparatus, a part of the support member is inserted, and a detachment prevention unit is provided to prevent the support member from detaching from the main body side,
The portion of the separation preventing portion into which the part of the support member is inserted is formed by an elongated hole extending along a direction in which the support member is urged. 4. The image forming apparatus according to any one of items 1 to 3. A sheet is transported by using a driving member that rotates and a plurality of rotating units that are arranged side by side in the axial direction of the driving member and that are arranged in contact with the driving member and rotate by receiving driving force from the driving member. Conveying means;
A support member that is shared for the plurality of rotating parts, supports the plurality of rotating parts, and supports the plurality of rotating parts from the side opposite to the side on which the driving member is installed,
Biasing means for biasing the support member toward the drive member;
A sheet conveying apparatus comprising: The support member is urged toward the drive member, and the rotation member is pressed against the drive member, so that the drive member is curved,
The paper conveying apparatus according to claim 5, wherein the support member is variably provided so that each of the plurality of rotating units moves following the curved driving member. The support member is provided so as to be swingable about a predetermined swing center, and is biased toward the drive member by pressing a predetermined pressed portion by the biasing means. ,
The paper conveyance according to claim 5 or 6, wherein the position of the swing center in the axial direction of the drive member and the position of the pressed portion in the axial direction are aligned in the axial direction. apparatus.

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